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I bougtan USB EXTERNAL GPS (30 € from Banggood). I downloaded App “Here you are GPS” from Google Play.
In android, go to settings, developper settings and in the USB section Allow mockup devices.
To start, connect the USB GPS, open “You are here”. Tap “Connect”. Don’t close it and go to the screen with applications and open your map app. To me it works fine with Google maps and a marine app (Boating HD)
Fernando